This Article establishes minimum dimensions for landings, and addresses the various situations that have an impact on the minimum dimensions, such as doors opening onto landings, and stairs with different widths ending on the same landing. These minimum dimensions are intended to provide enough room to accommodate door swing and to allow safe passage.
A landing should provide sufficient room for a person to stand while opening or closing a door. The general rule is that the landing should be as wide and as long as the width of the stair or ramp that it serves.
Quoted from Illustrated User's Guide - NBC2015
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